It's not just the "kids on rice rockets" that give motorcyclists a bad name. There are an equal amount of inexperienced and/or risky riders, young and old, on Harleys.
Absolutely Wild Card!
This isn't the only example I've witnessed, but by far it was the stupidest:
Riding home from Reno (After St. Vibes) two or three years ago on I-80, there was a tractor trailer jackknifed, that had tied up traffic to the top of the mountains. Close to 30 miles of vehicular snarl. It was snowing and then raining hard at the lower elevations. Wife and I were being good citizens and pacing the traffic going from 0 to 25 mph. I don't split lanes with her on board, ever. Flying by at stupid speeds were a number of bikes, many two-up going at least 50 - 60 mph between virtually stopped vehicles. They obviously had a death wish. Visibility was poor. There was no way they could control those big bikes if a vehicle changed lanes in front of them. The roads were soaked and traffic in all lanes nearly stopped at times. Darwin's theory at work again. Fortunately, we didn't have to witness anything as a result.
Regarding lane splitting...
Some people are far more comfortable lane splitting than I am. I will try to gracefully wind my way through traffic and when once in a while a nice cager moves over to let me through, I often take them up on it. At least I know they know I'm there. But, I remember the feeling I had the first time a lane splitter passed me on I 880. It was around mid 2001. I was doing at least 50 in very heavy traffic and this rice rocket passed as if I were standing still. Until he passed, I had no idea he was coming. Very shocking for a moment. Having just moved back to California, I wasn't used to this and it was a real eye opener. Now I watch for them always when driving my cage.
I commute on my bike nearly every day, weather permitting, because I love riding and because I get to use the carpool lane. Saves fuel too...three wins. Even so, often I have someone blow by me as if I'm standing still. In between the cars they go as if everyone knows they're there. I mean faster than common sense would allow. The statistics tell the rest of the story. It's worse during the best weather periods. I've noticed a slight decline, since the recession hit. Could be at least one good side effect.
Keep in mind, many drivers in this state are just visiting California. They don't know this is legal and aren't watching for us.
I've made my share of bonehead decisions in life, but thank God it didn't result in anything drastic. Also, I've done loads of group rides, with riders of many levels of experience. One inexperienced rider highsided his bike on Hwy 9 approaching a hairpin curve. We had plenty of time to stop and help him, rather than plow into him. Aside from a bruised ego, he was okay and rode back home after he enjoyed lunch at Alice's with us. Another had his rear tire blow on 120 in Manteca. He was riding a '99 Indian. The Hwy bar had a point near the bottom side of the bar and it caught the road as he wobbled to a stop, tossing him and the bike. Fortunately he too walked away from it. An inexperienced rider might have not fared as well. I convinced him to put a rounded crash bar on his bike.
Accidents happen. We could second guess the guys in the video all day long. Based on what I read on their board and saw in the video, it appears to be rider error on both parts. We have the good luck to be watching the video and not be entangled in the mess they created on the road. This is a good lesson as to why we give enough space between bikes, especially on a curvy road. Far too often when riding in the Santa Cruz Mountains, sport bikes routinely pass me on double yellow curves, just inviting potential disaster. I slow down and give them plenty of room, when I see them coming. At times I don't...whew!
Okay...bla, bla, bla...sorry for the ramblings. This situation definitely strikes an emotional cord for most of us. We all love riding, don't want to crash and don't like seeing someone else do it to themselves and others.
Practice, practice, practice.

By the way, anyone near the SF South Bay who would like to do some parking lot practice time, I have the markers and layouts for some good exercises. Let me know and we'll get something organized. I'm also open to any training suggestions as well. I know about the "Ride Like A Pro" classes and plan to attend this spring. But until then...